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Marlow Works

AP Macroeconomics / Open Economy—International Trade and Finance

Lesson

Exchange rates as prices

The foreign-exchange market prices one currency in terms of another.

Learning goals

  • Show how demand and supply of a currency set its exchange rate.
  • Connect appreciation to net exports.

Explanation

An exchange rate is a price. If people want more dollars to buy U.S. goods or assets, dollar demand rises and the dollar can appreciate. If Americans want more foreign currency to import or invest abroad, they supply dollars and the dollar can depreciate.

When the dollar appreciates, U.S. goods look more expensive to foreign buyers and foreign goods look cheaper at home. Net exports tend to fall. Depreciation works the other way. That channel is one reason domestic interest-rate policy leaks into AD through the open economy.

Key terms

  • Appreciation. A rise in the value of a currency relative to another currency.
  • Net exports. Exports minus imports; a component of aggregate demand.

Common mistakes

  • Saying an appreciated currency makes exports cheaper.
  • Treating a floating rate as a policy target instead of a market price.

Practice

Original Marlow Works items. Check the answer explanation after you try.

1 of 2Economic Indicators and the Business Cycle · easy · multiple choice

Nominal GDP rises from one year to the next while real GDP is unchanged. Which interpretation is best?

Original Marlow Works item — not a College Board question.

Take your time—this is practice, not a test.

Answer explanation

Foreign tourists suddenly want more trips to a country. What happens to that country’s currency, other things equal?

Answer. Demand for the currency rises and it appreciates.

Tourists need the local currency, so they bid up its price.

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Related resources

External links with reuse status. Marlow Works is independent and does not copy restricted exam or textbook material.

  • Official / link only

    AP Macroeconomics course page

    Official six-unit framework for national income and policy models.

    College Board · All rights reserved · accessed 2026-10-01

    Open source

  • Official / link only

    FRED economic data

    Federal Reserve economic data. Terms vary by series; do not scrape or ingest.

    Federal Reserve Bank of St. Louis · Varies by series · accessed 2026-10-01

    Open source